Name That Trauma :: Reader Aerial on a Mysterious Merry-Go-Round

Hello lovelies, this is incredibly obscure and patchy but maybe SOMEONE can help me out here.

It can’t have been later than 1974 or 1975, when I started watching a movie on T.V. It MAY have been set in Australia. A mummy and daddy put their tyke on a carousel and wave to him every time he goes past. But when the ride stops..he’s gone. They go searching into the surrounding bushland to no avail. When they return to the carousel site, it is of course GONE, leaving a strange impression on the cement or grass..something frog-shaped, I think.

This is my first memory of being thrilled and frightened and I would love to know if anyone knows what I was watching!